XRD87L75 Datasheet, PDF (1/15 Pages) Exar Corporation – Low-Voltage CMOS 8-Bit High-Speed Analog-to-Digital Converter

FEATURES
· 8-Bit Resolution
· Up to 10MHz Sampling Rate
· Internal S/H Function
· Single Supply: 3.3V
· V_IN DC Range: 0V to V_DD
· V_REF DC Range: 1V to V_DD
· Low Power: 25mW typ. (excluding reference)
· Latch-Up Free
XRD87L75
Low-Voltage CMOS 8-Bit High-Speed
Analog-to-Digital Converter
· ESD Protection: 2000V Minimum
· Small 20-Pin SOIC/SSOP Packages
April 2==2 1
APPLICATIONS
· Digital Color Copiers
· Cellular Telephones
· CCD-Based Systems
· Hardware Scanners
· Video Capture Boards
GENERAL DESCRIPTION
The XRD87L75 is an 8-bit Analog-to-Digital Converter in
a small 20-pin SOIC/SSOP package. Designed using
an advanced 3.3V CMOS process, this part offers
excellent performance, low power consumption and
latch-up free operation.
This device uses a two-step flash architecture to
maintain low power consumption at high conversion
rates. The input circuitry of the XRD87L75 includes an
on-chip S/H function and allows the user to digitize
analog input signals between AGND and AV_DD. Careful
design and chip layout have achieved a low analog input
capacitance. This reduces “kickback” and eases the
requirements of the buffer/amplifier used to drive the
XRD87L75.
SIMPLIFIED BLOCK AND TIMING DIAGRAM
The designer can choose the internally generated
reference voltages by connecting V_RB to V_RBS and V_RT to
V_RTS , or provide external reference voltages to the V_RB
and V_RT pins. The internal reference generates 0.4V at
V_RB and 1.72V at V_RT. Providing external reference
voltages allows easy interface to any input signal range
between GND and V_DD. This also allows the system to
adjust these voltages to cancel zero scale and full
scale errors, or to change the input range as needed.
The device operates from a single +3.3V supply. Power
consumption is 25mW at F_S = 6MHz.
Specified for operation over the commercial / industrial
(-40 to +85°C) temperature range, the XRD87L75 is
available in Surface Mount (SOIC), Shrink Small Out-
line (SSOP) and Plastic Dual-In-line (PDIP) Packages.
Rev. 1.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone]